diff --git a/packages/pen-ai-skills/corpus/ab-v1/mobile-phone-input.yaml b/packages/pen-ai-skills/corpus/ab-v1/mobile-phone-input.yaml
new file mode 100644
index 000000000..e67689c66
--- /dev/null
+++ b/packages/pen-ai-skills/corpus/ab-v1/mobile-phone-input.yaml
@@ -0,0 +1,26 @@
+id: mobile-phone-input
+category: mobile
+difficulty: obvious
+prompt: |
+  Design ONLY a phone-number input field for an international
+  signup screen. The field has a "Phone number" label above (with
+  a red asterisk because it's required), then a single 44px-tall
+  row container with rounded corners and a thin slate border. The
+  row content from left to right:
+    - a country selector area showing a small US flag (🇺🇸), the
+      dial code "+1", and a chevron-down indicator
+    - a thin vertical divider
+    - the digits input area showing the placeholder text
+      "(555) 555-5555" in muted slate
+  Do NOT render a dropdown menu, surrounding form, or other
+  inputs — just the one phone-number row.
+expected:
+  must_contain_roles:
+    - phone-input-field
+    - phone-input-row
+    - phone-input-country
+    - phone-input-code
+    - phone-input-chevron
+    - phone-input-divider
+    - phone-input-digits-text
+expected_tool_if_any: add_phone_input_v0
diff --git a/packages/pen-ai-skills/src/corpus/__tests__/corpus-loader.test.ts b/packages/pen-ai-skills/src/corpus/__tests__/corpus-loader.test.ts
index a39ebf206..b58d5bb81 100644
--- a/packages/pen-ai-skills/src/corpus/__tests__/corpus-loader.test.ts
+++ b/packages/pen-ai-skills/src/corpus/__tests__/corpus-loader.test.ts
@@ -65,20 +65,20 @@ describe('loadCorpus — real corpus', () => {
 describe('loadCorpus — v1 supplemental corpus (new tools)', () => {
   // v1 covers tools added after the v0 freeze, in chronological batches:
   // 2026-04-22 (12 tools) / 2026-04-24 (5 tools, 4 v0 + first v1) /
-  // 2026-04-25 (6 tools, 4 v0 + 2 v1). All obvious — one prompt per
+  // 2026-04-25 (7 tools, 5 v0 + 2 v1). All obvious — one prompt per
   // tool so A/B runs can measure routing + legality on the new surface
   // without re-running the v0 corpus. See `corpus/ab-v1/README.md`.
-  it('loads 23 prompts, all obvious, one per new tool', () => {
+  it('loads 24 prompts, all obvious, one per new tool', () => {
     const prompts = loadCorpus(REPO_CORPUS_V1_DIR);
-    expect(prompts).toHaveLength(23);
-    expect(new Set(prompts.map((p) => p.id)).size).toBe(23);
+    expect(prompts).toHaveLength(24);
+    expect(new Set(prompts.map((p) => p.id)).size).toBe(24);
     for (const p of prompts) {
       expect(p.difficulty).toBe('obvious');
       expect(p.expected_tool_if_any).toMatch(/^add_[a-z_]+_v\d+$/);
     }
   });
 
-  it('covers 2026-04-22 (12) + 2026-04-24 (5) + 2026-04-25 (6) batches', () => {
+  it('covers 2026-04-22 (12) + 2026-04-24 (5) + 2026-04-25 (7) batches', () => {
     const prompts = loadCorpus(REPO_CORPUS_V1_DIR);
     const tools = new Set(prompts.map((p) => p.expected_tool_if_any));
     expect(tools).toEqual(
@@ -102,11 +102,12 @@ describe('loadCorpus — v1 supplemental corpus (new tools)', () => {
         'add_attachment_row_v0',
         'add_chat_bubble_v0',
         'add_modal_shell_v1',
-        // 2026-04-25 batch (6 tools) — 4 new v0 + 2 new v1
+        // 2026-04-25 batch (7 tools) — 5 new v0 + 2 new v1
         'add_social_login_row_v0',
         'add_pricing_card_v0',
         'add_stat_card_v0',
         'add_range_slider_v0',
+        'add_phone_input_v0',
         'add_toast_v1',
         'add_empty_chart_v1',
       ]),